The double-fuel oil pump system for jetting two kinds of fuel oil in diesel engine includes mainly oil sprayer with oil inlet hole, slide valve with right spring and left spring, slide block, right and left slide valve oil pipes, diesel oil pump, diesel oil filter, diesel oil tank, fuel substitute pump, fuel substitute filter, fuel substitute tank and oil sprayer return pipe. The present invention can regulate the sectional spraying time of two kinds of fuel via regulating the oil supplying ahead angle of the two fuel oil pumps and control the sprayed amount of each kind of the fuel oil via regulating the oil amount regulating mechanism on two fuel oil pumps, and has obvious economic utility.